How to test the first characters of a file in php? - php

Question

I have a PHP code that allows me to read a csv file, insert the data into the database and move this file to another folder once the processing is finished.
This code works by default with UTF8 BOM files, I added the line fseek($handle, 3); to pass the first 3 characters.
I would like to know how I can execute the same code for UTF8 files by integrating the lines directly or in UTF8 BOM by starting after the first 3 characters?
<?php
include("connexion.php");
$dir = '//server/d$/ftp/GET/';
$allFiles = scandir($dir);
$dest = '//server/d$/ftp/GET/COPIES/';
foreach($allFiles as $file) {
if (!in_array($file,array(".","..")))
{
$file = $dir.$file;
$filename = basename( $file );
if ( strpos( $filename, 'BI1_' ) === 0 )
{
if (($handle = fopen($file, "r")) !== false)
{
//To remove BOM in the first cell
fseek($handle, 3);
$bi1_values = array();
while (($data = fgetcsv($handle, 9000000, ";")) !== false)
{
$bi1_values[] = "('$data[0]', '".str_replace("'", "''",$data[1])."','$date1','$date2','$data[2]','$data[4]','".str_replace("'", "''",$data[5])."','".str_replace("'", "''",$data[6])."')";
if (count($bi1_values) == 1000)
{
$query = "insert into dbo.Sales (storenumber, storename, date, time, TransRef, stylecode, color, size)
values " . implode(',', $bi1_values);
$stmt = $conn->query( $query );
if (!$stmt)
{
$file1 = "D:/xampp/htdocs/errors/erreur_BI1.txt";
file_put_contents($file1, $query . PHP_EOL, FILE_APPEND | LOCK_EX);
}
$bi1_values = array();
}
}
fclose($handle);
//Moving the file to another folder
if(!rename($file, $dest . $filename))
{
echo "error";
}
}
}
}
}
?>

Answer 1

Leave the file as is and remove the BOM characters from the $data array. So you can process both files with BOM and without BOM. Roughly:
$firstRow = true;
while (($data = fgetcsv($handle, 9000000, ";")) !== false) {
if($firstRow) {
$data[0] = str_replace("\xef\xbb\xbf","",$data[0]);
$firstrow = false;
}
//..
"\xef\xbb\xbf" is the string notation for a BOM.